apt-pkg/cachefile.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: cachefile.cc,v 1.8 2002/04/27 04:28:04 jgg Exp $
   4 /* ######################################################################
   5
   6    CacheFile - Simple wrapper class for opening, generating and whatnot
   7
   8    This class implements a simple 2 line mechanism to open various sorts
   9    of caches. It can operate as root, as not root, show progress and so on,
  10    it transparently handles everything necessary.
  11
  12    ##################################################################### */
  13                                                                         /*}}}*/
  14 // Include Files                                                        /*{{{*/
  15 #include <config.h>
  16
  17 #include <apt-pkg/cachefile.h>
  18 #include <apt-pkg/error.h>
  19 #include <apt-pkg/sourcelist.h>
  20 #include <apt-pkg/pkgcachegen.h>
  21 #include <apt-pkg/configuration.h>
  22 #include <apt-pkg/policy.h>
  23 #include <apt-pkg/pkgsystem.h>
  24 #include <apt-pkg/fileutl.h>
  25 #include <apt-pkg/progress.h>
  26 #include <apt-pkg/depcache.h>
  27 #include <apt-pkg/mmap.h>
  28 #include <apt-pkg/pkgcache.h>
  29
  30 #include <string.h>
  31 #include <unistd.h>
  32 #include <string>
  33 #include <vector>
  34
  35 #include <apti18n.h>
  36                                                                         /*}}}*/
  37 // CacheFile::CacheFile - Constructor                                   /*{{{*/
  38 pkgCacheFile::pkgCacheFile() : d(NULL), ExternOwner(false), Map(NULL), Cache(NULL),
  39                                 DCache(NULL), SrcList(NULL), Policy(NULL)
  40 {
  41 }
  42 pkgCacheFile::pkgCacheFile(pkgDepCache * const Owner) : d(NULL), ExternOwner(true),
  43    Map(&Owner->GetCache().GetMap()), Cache(&Owner->GetCache()),
  44    DCache(Owner), SrcList(NULL), Policy(NULL)
  45 {
  46 }
  47                                                                         /*}}}*/
  48 // CacheFile::~CacheFile - Destructor                                   /*{{{*/
  49 // ---------------------------------------------------------------------
  50 /* */
  51 pkgCacheFile::~pkgCacheFile()
  52 {
  53    if (ExternOwner == false)
  54    {
  55       delete DCache;
  56       delete Cache;
  57       delete Map;
  58    }
  59    delete Policy;
  60    delete SrcList;
  61    if (ExternOwner == false)
  62       _system->UnLock(true);
  63 }
  64                                                                         /*}}}*/
  65 // CacheFile::BuildCaches - Open and build the cache files              /*{{{*/
  66 class APT_HIDDEN ScopedErrorMerge {
  67 public:
  68    ScopedErrorMerge() { _error->PushToStack(); }
  69    ~ScopedErrorMerge() { _error->MergeWithStack(); }
  70 };
  71 bool pkgCacheFile::BuildCaches(OpProgress *Progress, bool WithLock)
  72 {
  73    if (Cache != NULL)
  74       return true;
  75
  76    ScopedErrorMerge sem;
  77    if (_config->FindB("pkgCacheFile::Generate", true) == false)
  78    {
  79       FileFd file(_config->FindFile("Dir::Cache::pkgcache"), FileFd::ReadOnly);
  80       if (file.IsOpen() == false || file.Failed())
  81          return false;
  82       Map = new MMap(file, MMap::Public|MMap::ReadOnly);
  83       Cache = new pkgCache(Map);
  84       return _error->PendingError() == false;
  85    }
  86
  87    if (WithLock == true)
  88       if (_system->Lock() == false)
  89          return false;
  90
  91    if (_error->PendingError() == true)
  92       return false;
  93
  94    BuildSourceList(Progress);
  95
  96    // Read the caches
  97    bool Res = pkgCacheGenerator::MakeStatusCache(*SrcList,Progress,&Map, true);
  98    if (Progress != NULL)
  99       Progress->Done();
 100    if (Res == false)
 101       return _error->Error(_("The package lists or status file could not be parsed or opened."));
 102
 103    /* This sux, remove it someday */
 104    if (_error->PendingError() == true)
 105       _error->Warning(_("You may want to run apt-get update to correct these problems"));
 106
 107    Cache = new pkgCache(Map);
 108    if (_error->PendingError() == true)
 109       return false;
 110    return true;
 111 }
 112                                                                         /*}}}*/
 113 // CacheFile::BuildSourceList - Open and build all relevant sources.list/*{{{*/
 114 // ---------------------------------------------------------------------
 115 /* */
 116 bool pkgCacheFile::BuildSourceList(OpProgress * /*Progress*/)
 117 {
 118    if (SrcList != NULL)
 119       return true;
 120
 121    SrcList = new pkgSourceList();
 122    if (SrcList->ReadMainList() == false)
 123       return _error->Error(_("The list of sources could not be read."));
 124    return true;
 125 }
 126                                                                         /*}}}*/
 127 // CacheFile::BuildPolicy - Open and build all relevant preferences     /*{{{*/
 128 // ---------------------------------------------------------------------
 129 /* */
 130 bool pkgCacheFile::BuildPolicy(OpProgress * /*Progress*/)
 131 {
 132    if (Policy != NULL)
 133       return true;
 134
 135    Policy = new pkgPolicy(Cache);
 136    if (_error->PendingError() == true)
 137       return false;
 138
 139    if (ReadPinFile(*Policy) == false || ReadPinDir(*Policy) == false)
 140       return false;
 141
 142    return true;
 143 }
 144                                                                         /*}}}*/
 145 // CacheFile::BuildDepCache - Open and build the dependency cache       /*{{{*/
 146 // ---------------------------------------------------------------------
 147 /* */
 148 bool pkgCacheFile::BuildDepCache(OpProgress *Progress)
 149 {
 150    if (DCache != NULL)
 151       return true;
 152
 153    if (BuildPolicy(Progress) == false)
 154       return false;
 155
 156    DCache = new pkgDepCache(Cache,Policy);
 157    if (_error->PendingError() == true)
 158       return false;
 159
 160    return DCache->Init(Progress);
 161 }
 162                                                                         /*}}}*/
 163 // CacheFile::Open - Open the cache files, creating if necessary        /*{{{*/
 164 // ---------------------------------------------------------------------
 165 /* */
 166 bool pkgCacheFile::Open(OpProgress *Progress, bool WithLock)
 167 {
 168    if (BuildCaches(Progress,WithLock) == false)
 169       return false;
 170
 171    if (BuildPolicy(Progress) == false)
 172       return false;
 173
 174    if (BuildDepCache(Progress) == false)
 175       return false;
 176
 177    if (Progress != NULL)
 178       Progress->Done();
 179    if (_error->PendingError() == true)
 180       return false;
 181
 182    return true;
 183 }
 184                                                                         /*}}}*/
 185 // CacheFile::RemoveCaches - remove all cache files from disk           /*{{{*/
 186 // ---------------------------------------------------------------------
 187 /* */
 188 void pkgCacheFile::RemoveCaches()
 189 {
 190    std::string const pkgcache = _config->FindFile("Dir::cache::pkgcache");
 191    std::string const srcpkgcache = _config->FindFile("Dir::cache::srcpkgcache");
 192
 193    if (pkgcache.empty() == false && RealFileExists(pkgcache) == true)
 194       unlink(pkgcache.c_str());
 195    if (srcpkgcache.empty() == false && RealFileExists(srcpkgcache) == true)
 196       unlink(srcpkgcache.c_str());
 197    if (pkgcache.empty() == false)
 198    {
 199       std::string cachedir = flNotFile(pkgcache);
 200       std::string cachefile = flNotDir(pkgcache);
 201       if (cachedir.empty() != true && cachefile.empty() != true && DirectoryExists(cachedir) == true)
 202       {
 203          cachefile.append(".");
 204          std::vector<std::string> caches = GetListOfFilesInDir(cachedir, false);
 205          for (std::vector<std::string>::const_iterator file = caches.begin(); file != caches.end(); ++file)
 206          {
 207             std::string nuke = flNotDir(*file);
 208             if (strncmp(cachefile.c_str(), nuke.c_str(), cachefile.length()) != 0)
 209                continue;
 210             unlink(file->c_str());
 211          }
 212       }
 213    }
 214
 215    if (srcpkgcache.empty() == true)
 216       return;
 217
 218    std::string cachedir = flNotFile(srcpkgcache);
 219    std::string cachefile = flNotDir(srcpkgcache);
 220    if (cachedir.empty() == true || cachefile.empty() == true || DirectoryExists(cachedir) == false)
 221       return;
 222    cachefile.append(".");
 223    std::vector<std::string> caches = GetListOfFilesInDir(cachedir, false);
 224    for (std::vector<std::string>::const_iterator file = caches.begin(); file != caches.end(); ++file)
 225    {
 226       std::string nuke = flNotDir(*file);
 227       if (strncmp(cachefile.c_str(), nuke.c_str(), cachefile.length()) != 0)
 228          continue;
 229       unlink(file->c_str());
 230    }
 231 }
 232                                                                         /*}}}*/
 233 // CacheFile::Close - close the cache files                             /*{{{*/
 234 // ---------------------------------------------------------------------
 235 /* */
 236 void pkgCacheFile::Close()
 237 {
 238    if (ExternOwner == false)
 239    {
 240       delete DCache;
 241       delete Cache;
 242       delete Map;
 243    }
 244    else
 245       ExternOwner = false;
 246    delete Policy;
 247    delete SrcList;
 248    _system->UnLock(true);
 249
 250    Map = NULL;
 251    DCache = NULL;
 252    Policy = NULL;
 253    Cache = NULL;
 254    SrcList = NULL;
 255 }
 256                                                                         /*}}}*/